William t



(No Model.)

W. T. WILLARD.

THROTTLE'VALVB. y Y.

Patented Mayl 31,188'7.

N. PEYEAHS, Paluuwgnpign Washington, ILC.

` UNITED STATES PATENT OFFICE.

AVILLIAM T. VILLARD, OF- HAMPSHIRE, ILLINOIS.

TH RoTTLE-VALVE.

SPECIFICATION forming partrof Letters Patent No. 363,872, dated May 31, 1887.

l Application filed February 10, l18`87. Serial No. `QQ'IJFf). (No model.)

To all whom it. may concern: a A

Be it known that I, WILLIAM T. WILLARD, a citizen'cf the United States, residing at Hampshire,in the county of Kane and State of I llinois, have invented a new and useful Improvement in Throttle-Valves for Steam-Engi nes, of whichA th'efollowing is a specification.

My invention lrelates to an improvement in throttle-valves for steamengines; and it consists in the peculiar construction and combination of devices that Will be more fully set forth hereinafter, and particularly pointed out in the claims. i

In the drawings, Figure lis an elevation of the link-motion of a steam-engine with my improved throttle-valve attached thereto. Fig.

2 is a detached elevation of the throttle-valve.

' Fig. 3 is a vertical longitudinal sectional view tion of a cylinder.

of the same. Fig. 4 is a vertical transverse sectional view taken on the line fr x of Fig. '2.

A represents the valve-case, which comprises au ordinary T-coupling, such as is in common use for coupling pipes. To Aone end of the valve-case is screwed astufting-box, B, through which extends a valve rod, C. The inner yend of the valve-rod isprovided with a transverse longitudinal slot, D. l

E represents a shoe comprising separable sections F and G, each of which forms a porprojects a web, H, which forms a key that is adapted to enter the slot in the rod C, and from the lupper side of the said web or key projects a stud, I, which enters a central opening made in the upper section,'G. A iiat curved spring, K, is placed on the upper side of the k'ey or web, andbears against the under side of the upper section, G, and serves to normally press thesections F and G from each other, so as to cause the shoe to t snugly in the cylindrical bore of the valve-case. The said spring'K is provided with a central opening, through'which the stud I projects, and thereby the said spring is secured rmly in place in the shoe. This shoe is adapted to Work over the central opening, L, of the valve-case, which communicates with the pipe M, that leads to the steam-chest ofthe engine. The end of the valve-case which is-oppositethe stuffing-box communicates with the boiler of the engine.y

It will be observed by reference to Figs. 3

and 4 that the sides of the shoe are open from From the lower section, F,

end to end thereof, so that the steam which enters the valve-case from` the boiler -is free to pass through the reciprocating shoe. This prevents the steam from pressing against-either end of the shoe, and enables the latter to be easily moved lengthwise inthe case, so as to :either entirely close the opening L or to open the same to the desired extent, according to the quantity of steam which it is desired to feed to the engine.

` Ordinarily reversing engines are provided with two operating-levers, one attached to the throttle-valve and the other attached to the link-motion. lever to operate both the throttle-valve and the link-motion, and thus enable the engine to bev stopped, started, or reversed by a single movement on the part of the engineer, and to this end I connect the operating-rod of the throttlevalve to the lever a, which is connected to the link-motion, as shown in Fig. 1. The said lever a works against a segment-plate, b, andis provided with the usual locking bolt or detent, 0,' to engage-the notches of the segment-plate,

I propose to employ only onevl and thereby lock the operating-lever at any desired point.

As shown at Fig. l., the lever a is at its initial position and the shoe of the throttle-valve is over the discharge-opening of the valve K, thus closing communication between the boiler and the steamchest of the engine. When thelever is in this position, the link is moved so that the slide-pin attached to the valve-stem of the engine is directly in the center of the link, and thereby no motion is communicated to the side valve of the engine from the shaft d thereof, and consequently the engine is at rest. By

ymoving the lever a in either direction the case having the opening L and the endwise movable shoe in the said case adapted to close or open the said opening, said shoe comprising the cylindrical section F, bearing against one side of the valve-case, and having the key or web H, provided on its outer edge with the stud I, the section G, bearing against the opposite side of the case and having the central opening to receive the stud, and the dat spring K, bearing between the opposing sides of the key or web and of the section G, and having an opening through which the stud projects, substantially as described.

2. In a throttle-valve, the combination ofthe case having the opening L, the rod arranged to reciprocate longitudinally in the oase, and having the opening D, the cylindrical section valve-case, and thespring bearing between the key or web and the section G, for the purpose set forth, substantially as described.

In testimony that I claim the foregoing as my own I have hereto aixed my signature in presence of two witnesses.

WILLIAM 'IY WILLARD. Witnesses:

G. W. TERWILLIGER, DAVID WV. SHoLEs. 

